JPH0480131B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for preventing the occurrence of weaving steps in a loom.

Prior Art Generally, a warp sending device of a loom is equipped with a transmission that controls the amount of warp feeding based on fluctuations in warp tension, and maintains the tension of the warp fed from the warp beam within an appropriate tolerance range. To achieve this, the tension of the warp threads is detected by a tension roller that is displaced in accordance with fluctuations in the tension of the warp threads, and when the tension becomes greater than an allowable range, the transmission is shifted in the direction of increasing the warp delivery speed of the warp beam. On the other hand, when the warp tension deviates from a permissible range and becomes smaller, the transmission ratio of the transmission is adjusted to reduce the warp delivery speed of the warp beam. Therefore, during normal loom operation, the warp tension is automatically corrected by the warp feeding device as described above, and a woven fabric of uniform density is woven.

However, when the loom is restarted after stopping its operation, the beating strength is not sufficient due to the stand-up characteristics of the loom, unlike when the loom is normally operated, and thin corrugations occur in the fabric. Therefore, conventionally, when restarting a loom after it has stopped operating, a load is applied to the warp threads, and the loom is restarted with the warp tension temporarily increased to prevent the occurrence of weaving steps due to the stoppage of the loom. method has been adopted.

However, in this method of preventing the occurrence of weaving steps, the warp tension is uniformly increased when the loom is restarted, regardless of the reason why the loom was stopped, or the warp tension is increased when the warp breaks.
By making a distinction such as not increasing the warp tension when the weft breaks, we were able to prevent the occurrence of weaving steps when restarting the loom after stopping it, but weft insertion errors caused problems with the loom. After the operation is stopped, if the machine is reversed and the machine is restarted after that, the effect of preventing the occurrence of weaving steps as described above cannot be obtained. I couldn't do it. According to the results of various experiments conducted by the inventor of the present application, the reasons for not being able to obtain the above-mentioned effect of preventing the formation of weaving rows are the shedding movement during reversal of the machine to remove misplaced threads, warp thread tension, fabric density, or weaving. It has been discovered that the cause of the weaving stage is that the fabric structure near the front of the weaving loosens due to the relationship between the immediately following fabric structures, etc., and the fabric moves to the rear of the loom from its original position.

This phenomenon of weaving steps is particularly noticeable in dense fabrics.

Purpose The present invention has been made in consideration of the above-mentioned problems, and its purpose is to solve the problem when restarting the machine after reversing the machine due to a weft insertion error or a weft supply error. It is an object of the present invention to provide a method for preventing the occurrence of weaving steps.

Configuration In order to achieve the above-mentioned object, in the present invention, an electromagnetic device is installed in the drive path of a warp feeding device equipped with a transmission that controls the amount of warp feeding based on warp tension fluctuations, and in the drive path of a fabric winding device. After the machine stops due to a weft insertion error or weft supply error, etc., the machine is reversed, and as the machine is reversed, the warp feeding device and cloth winding device are operated, and the machine During the reversal period of the table, the electromagnetic clutch is decoupled only for a predetermined period corresponding to the amount of movement of the woven cloth due to the removal of misplaced threads, and the warp is pulled back by the warp sending device and the woven fabric is wound by the woven fabric winding device. The return is stopped, and during other periods, the electromagnetic clutch is operatively connected to interlock the warp feeding device and the cloth winding device with the reversal of the machine frame, thereby controlling the amount of movement of the loom as the machine base reverses. I did it like that.

Embodiment Hereinafter, an embodiment in which the present invention is embodied in a fluid jet loom will be described based on FIGS. After being guided to the system 4 side and woven into the woven fabric W in the same opening system 4, it passes through an expansion bar 5 and between a surf S roller 6 and a press roller 7 that are in pressure contact with each other to remove wrinkles. After being slidingly guided by the guide member 8, the machine drive motor M is connected via the crankshaft 9.
The material is wound onto a winding shaft 10 operatively connected to the winding shaft 10 .

The tension roller 3 is rotatably supported at one end of a tension lever 12 that can reciprocate around a shaft 11, and is tensioned by a balance weight 13 suspended from the other end of the tension lever 12. The roller 3 is pressed against the warp threads T, and a predetermined tension is applied to the warp threads T. Therefore, the tension roller 3 is displaced up and down in response to fluctuations in the tension of the warp threads T, and this vertical movement is transmitted via the tension lever 12 and a link 14 connected to the lever 12 to a transmission that constitutes a warp delivery device. The signal is transmitted to the gear shift lever 15a of No. 15.

The transmission 15 is provided with an input pulley 15b and an output gear 15c, and the rotational driving force of the machine drive motor M is operatively connected to the double pulley 17, which is fixed to the crankshaft 9 and the shaft 16. The transmission 15 is connected to the pulley 18 via the pulley 20 which is also fixed to the shaft 19 to which the pulley 18 is fixed.
is transmitted to the input pulley 15b.

The transmission 15 is configured to always change the direction of rotation on the input side to the direction of rotation in one direction on the output side, that is, the direction in which the warp threads T are sent out from the warp beam 1. Accordingly, a reversing mechanism 21 is provided between the output gear 15c of the transmission 15 and the warp beam shaft 1a. That is, output gear 1
A pair of opposing bevel gears 26A and 26B, which are not rotatable with respect to the shaft 25 but are slidably mounted on the same axis, can mesh with the bevel gear 24 provided at one end of the shaft 23 of the gear 22 that meshes with the gear 5c. The switching lever 29, which is urged to rotate around the shaft 28 by the spring 27, is switched in accordance with the excitation and demagnetization of the electromagnetic solenoid 30. During normal operation and when the loom is stopped, the bevel gear 26A meshes with the bevel gear 24, and the rotation of the output gear 15c is caused by the gear 22, the bevel gears 24 and 26A, the worm 31 provided at one end of the shaft 25, and the worm gear. 32 and the same gear 32
is transmitted to the warp beam gear 1b via the gear 34 provided at the other end of the shaft 33 to which the warp beam shaft 1a is rotated in the direction in which the warp threads T are sent out. When the electromagnetic solenoid 30 is energized, the switching lever 29 is rotated counterclockwise about the shaft 28 against the spring 27, and the bevel gear 26B engages with the bevel gear 24 as shown in FIG. However, the rotation of the output gear 15c is converted to the opposite direction and transmitted to the warp beam shaft 1a, and the warp beam shaft 1a is rotated in a direction to pull back the warp threads T.

On the other hand, the winding shaft 10 obtains its driving force from the Surf S roller 6 by means of an operation coupling means (not shown), and the Surf S roller is rotated by a gear 35 and a shaft 36 fixed to one end of the roller shaft 6a. A gear 37 and a shaft 36 are supported and meshed with the gear 35.
It is operatively connected to the crankshaft 9 via a pulley 38 fixed thereto and the double pulley 17 operatively connected to the pulley 38. Therefore, depending on the forward and reverse rotation of the machine drive motor M, the surf S roller 6
And the winding shaft 10 is configured to be rotated forward and backward.

Note that the operational connection means between the Surf S roller 6 and the winding shaft 10 is equipped with a friction pressure welding mechanism, and the woven fabric W
As the winding diameter of the winding shaft 10 increases, the rotation of the winding shaft 10 decreases.

In this embodiment, an electromagnetic clutch 40 is mounted on the shaft 16.

A clutch body 40a that is slidable in the direction of the shaft 16 and unrotatably supported on the same axis is always pressed by a spring 40b to a clutch portion 17a of a double pulley 17 that is rotatably supported on the shaft 16. When the pulley 16 is rotated, the double pulley 17 is also rotated. And solenoid 4
When 0c is excited, the clutch body 40a moves against the clutch portion 17 against the spring 40b, as shown in FIG.
The rotation of the shaft 16 is separated from the double pulley 17
It is designed not to be transmitted to solenoid 40
c is designed to be excited by a command from the control device C based on the ON operation of the machine reverse operation button B. The control device C is the machine rotation angle detection device 4
1 (for example, a known rotary encoder is used).
The excitation command is sent to c, and
An excitation command is sent to the electromagnetic solenoid 40 based on the ON operation of the machine reverse operation button B.

In this embodiment, the machine rotation angle when the machine stops is θ, and the excitation command from the control device C to the solenoid 40c based on the ON operation of the machine reverse operation button B is [θ1, θ] (θ1< The operation is performed within the machine rotation angle range of θ), and the operation of this embodiment will be described below based on this condition.

Now, when the loom is in a normal operating state, wefts are injected from a main nozzle (not shown) into the weft guide holes 43a of the weft guide members 43 arranged in parallel on the slay 42, as shown in FIG. Reed 44
It is driven into the fabric front W1 of the woven fabric W. While the weft yarns are inserted normally, the loom continues to operate, the warp yarns T are sequentially sent out from the warp beam 1, and the woven fabric W is wound around the winding shaft 10. In this state, the tension of the warp threads T fluctuates due to various causes, but this tension fluctuation of the warp threads is extracted as a vertical displacement of the tension roller 3, and the same displacement is transmitted to the speed change lever 15a. That is, the gear ratio of the transmission 15 is automatically adjusted according to the fluctuation of the warp tension, and when the warp tension becomes larger than the allowable range, the warp delivery speed of the warp beam 1 is increased, and conversely, the warp delivery speed is increased. When the tension decreases, the warp delivery speed of the warp beam 1 is reduced. Therefore, the tension of the warp yarns is always maintained at an appropriate level, and no weaving steps occur in the woven fabric W.

When a weft insertion error occurs, the control device C sends a stop command to the drive motor M based on a weft insertion error detection signal from a light emitting/receiving type weft detection device (not shown) provided on the slay 42, and the machine operation is stopped. will be stopped. At this time, as shown in Fig. 5a, the misplaced thread Y2 is woven into the woven fabric W, and then the machine base rotates approximately once based on inertial operation, and the weft thread Y3 following the misplaced thread Y2 is beaten. The machine base stops at the rotation angle θ in the previous state, and the woven fabric W1, that is, the missed thread Y2, is located at the beating point P of the reed 44. Therefore, when the machine reverse rotation operation button B is pressed in order to remove the misplaced thread Y2, an excitation command is sent from the control device C to the solenoid 40c of the electromagnetic clutch 40 and the electromagnetic solenoid 30, and the drive motor M is activated to reverse rotation. Commands are sent. Therefore, the machine is reversed with the electromagnetic clutch 40 disengaged and the reversing mechanism 21 switched to the reverse direction. During this reversal of the machine, when the machine rotates approximately half a turn and the warp threads T1 and T2 reach the maximum open state, first, the weft thread Y3 inserted following the miss thread Y2 is pulled out.
Furthermore, when the machine frame rotates approximately one turn and the warp threads T1 and T2 are again in the maximum open state as shown in FIG. 5b, that is, when the reed 44
When Y2 reaches the position indicated by the solid line, the erroneous yarn Y2 is removed from the woven fabric W. After removing the misplaced thread Y2, turn on the machine reverse operation button to reverse the machine approximately half a turn and stop at the machine base rotation angle θ.

When the machine rotation angle shifts from θ to θ1 when the machine reverses after the machine stops due to the occurrence of the weft insertion error, the machine rotation angle detection device 41
The control device C stops the excitation command to the solenoid 40c of the electromagnetic clutch 40 in response to the angle detection signal from the electromagnetic clutch 40, and the clutch body 40a is again pressed against the clutch portion 17a of the double pulley 17, and the electromagnetic clutch 40
The working connection at is restored. Therefore, from the machine stop angle θ to the machine rotation angle θ1, the warp beam shaft 1a and the take-up shaft 9 are in a stopped state without being reversed, and the textile cloth W1 is not displaced.

When the machine rotation angle reaches θ1, as described above, the control device C stops the excitation command to the solenoid 40c of the electromagnetic clutch 40 based on the detection signal from the machine rotation angle detection device 41, and the operational connection of the electromagnetic clutch 40 is restored. and the warp beam shaft 1a and the winding shaft 1
0 reversal is started. Therefore, the warp threads T are pulled back, the woven fabric W is rewound, and the woven fabric W1 is moved backward. Therefore, since the amount of reversal of the entire woven fabric and warp is suppressed by appropriately setting the activation/decoupling time or the releasing angle of the electromagnetic clutch 40 depending on the type of woven fabric, even if the phenomenon of loosening of the woven fabric occurs, When the machine machine stops due to a weft insertion mistake, it rotates twice and stops, and when the machine is restarted, the weft thread W1, that is, the weft thread Y1 that was woven immediately before the mistake thread Y2, is woven in the weft direction as shown in Fig. 5c. It is possible to adjust the beating point P to the optimum beating point P, and no weaving steps will occur when the machine is restarted.

This effect of preventing the occurrence of weaving rows is due to the fact that the electromagnetic clutch 4 is activated during a predetermined machine rotation angle range when the machine machine is reversed.
This is obtained by releasing the operational connection of 0 and stopping the reversal of the warp beam shaft 1a and the winding shaft 10, and based on the stop of warp pullback on the warp beam 1 side and the stop of rewinding on the woven fabric W side. The returning amount of the woven fabric is stopped by a set amount, preventing the woven fabric from returning too much due to loosening of the fabric near the woven fabric as described in the prior art, and achieving the optimal beating point P when the woven fabric is restarted. This is because it is adjusted to

When the weft insertion error occurred, the machine reversed itself twice, but the weft broke in the main nozzle (not shown), and the cut weft was detected by the weft detection device, resulting in normal weft insertion. On the other hand, if a weft supply error occurs such that subsequent weft injection is not performed, it is necessary to reverse the machine three times. This is because, after the cut weft yarn is woven into the woven fabric, the machine table rotates approximately twice in conjunction with the weft supply operation. Even in the case of such a machine reverse rotation, the excessive return of the loom W1 due to the reverse rotation of the machine base is corrected by releasing the operation of the electromagnetic clutch 40, and the loom W1 is adjusted to the optimal beating point P at the time of restart. .

It should be noted that the present invention is not limited to the embodiments described above, and embodiments shown in FIGS. 6 to 8, for example, are also possible.

In the embodiment described above, the electromagnetic clutch 40 is attached to the shaft 16 that rotatably supports the double pulley 17 to simultaneously control the transmission of driving force to the warp beam shaft 1a and the winding shaft 10. However, in this embodiment, the pulley 20 is An electromagnetic clutch 4 is provided on the shaft 19 that rotatably supports the shaft 19 and the shaft 36 that rotatably supports the gear 37, respectively.
5 and 46 are installed, and the operation connection of each electromagnetic clutch 45 and 46 can be opened and closed independently of each other by commands from the control device C. Therefore, by appropriately controlling the activation/decoupling period of each electromagnetic clutch 45, 46, it is possible to adjust the weave W1 to the optimum beating point P at the time of restarting, as in the previous embodiment, and also to adjust the weaving area W1 to the optimal beating point P at the time of restart. For woven fabrics with large slackness, the warp tension is increased by increasing the amount of warp pullback than the amount of woven fabric unwinding, or conversely, for woven fabrics with a small woven structure, the amount of warp pullback is greater than the amount of warp pullback. This can be done by increasing the amount of unwinding and reducing the warp tension when restarting.

Further, in the present invention, the electromagnetic clutches 40, 45, 46
Instead of starting to release the operative connection at the same time as the start of the machine reverse rotation, it may be done during the machine reverse rotation, or the timing for returning the operative connection of the electromagnetic clutches 40, 45, and 46 may be set using a timer. .
Furthermore, the electromagnetic clutch may be installed at an appropriate position in the drive path of the warp sending-out device and the winding device other than the mounting position in the above embodiment, or the machine reverse rotation can be performed by hand, and the machine reverse rotation start signal may be used. The electromagnetic clutch may be disengaged accordingly.

Further, it is also possible to embody the present invention in a loom using a transmission that directly transmits forward and reverse rotation of the loom to the warp beam side.

Effects As detailed above, the method for preventing the occurrence of weaving steps according to the present invention operates the warp feeding device and the cloth winding device when the machine is reversed after the machine is stopped due to a weft insertion error or a weft supply error. Also, during a predetermined period of time during which the machine is reversing, the electromagnetic clutch is disengaged and the warp threads are not pulled back and the woven fabric is not rewound during a predetermined period corresponding to the movement of the woven fabric due to the removal of misplaced threads. While preventing the loom from returning too much due to loosening of the fabric in the vicinity, the loom position can be corrected by the amount corresponding to the number of reversals of the loom, so the loom position after reversing the loom matches the predetermined position, and the loom It has an excellent effect of preventing the occurrence of weaving steps when restarting after reversal.

[Brief explanation of drawings]

1 to 5 show an embodiment embodying the present invention; FIG. 1 is a schematic side view of a loom, FIG. Figure 3 is a partially cutaway plan view of the main part showing the state where the electromagnetic clutch is released from operation, Figure 4 is a side view showing the vicinity of the warp opening, and Figures 5 a, b, and c are all front views of the woven fabric. 6 to 8 show another example of the present invention, FIG. 6 is a schematic side view of the loom, and FIG. 7 is a partially cutaway diagram showing the operational connection state of a pair of electromagnetic clutches. FIG. 8 is a partially cutaway plan view of the main part showing a state in which the pair of electromagnetic clutches are released from the operational connection. Warp beam...1, Surf Srolla...
6. Winding shaft...10, Transmission...15, Electromagnetic clutch...40, 45, 46, Orimae W...1.

Claims (1)

[Claims] 1. An electromagnetic clutch is interposed in the drive path of the warp delivery device, which is equipped with a transmission that controls the amount of warp delivery based on warp tension fluctuations, and in the drive path of the fabric winding device, to prevent weft insertion errors or weft supply. After the machine is stopped due to a mistake, etc., the machine is reversed, and the warp feeding device and the fabric take-up device are activated as the machine is reversed. The operation of the electromagnetic clutch is released only for a predetermined period corresponding to the previous movement, and the warp retrieval by the warp sending device and the rewinding of the woven fabric by the woven fabric winding device are stopped, and for other periods. Prevention of weaving steps in a loom, characterized in that an electromagnetic clutch is operatively connected to interlock a warp sending-out device and a fabric winding device with reversal of the machine stand, and to control the amount of movement of the weaving cloth due to the reversal of the machine stand. Method.